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try 2 send n receive nrz ax 25 frame

I need help, I appriaciate if any one could help me
I try to send & receive NRZ ax.25 frame between two AT89s52 via pin data (I used P1_2)
I adapt the routine from John Hansen article, which use PIC 16 and CCS compiler.
So I adapt his code to SDCC, but the result is very unstable.
I predict the problem is in 'receive' routine ,but a month I try to solve this problem
I didn't make it.I'm very sure with 'send' routine but not with 'receive' one.
I want to examine this 'send & receive' system with logic analyzer, but I dont have one,
I only used Osciloscope. Help me plzzzzz,( here below the send & receive routine , I wrote)*/

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